Oskar Sala Mixtur-Trautonium

In 1948 Sala further developed the Trautonium into the Mixtur-Trautonium. The Mixtur-Trautonium allowed for the first time in music history the execution of sounds which had only been known in theory since the Middle Ages, but were never actually playable[example needed]. Sala's invention opened the field of subharmonics, the symmetric counterpart to overtones, so that a thoroughly distinct tuning evolved.

Sala presented his new instrument to the public in 1952 and would soon receive international licenses for its circuits. That same year, Harald Genzmer delivered the score to the first Concert For Mixtur-Trautonium And Grand Orchestra.

One of the first additions of Sala was to add a switch for changing the static tuning. Later he added a noise generator and an envelope generator (so called 'Schlagwerk'), formant filter (several bandpass filters) and the subharmonic oscillators. These oscillators generate a main pitch and several subharmonics, which are not multiples of the fundamental tone, but fractions of it. For any of the now two manuals, four of these waves can be mixed and the player can switch through these predefined settings. Thus, it was called the "Mixtur-Trautonium".

Oskar Sala composed music for industrial films, but the most famous was the bird noises for Alfred Hitchcock's The Birds. The Trautonium was also used in the Dresden première of Richard Strauss's Japanese Festival Music in 1942 for emulating the gongs- and bells-parts and in the 1950s in Bayreuth for the Monsalvat bells in Wagner's Parsifal.